White blood cells, coloured scanning electron micrograph (SEM). Seen here are two lymphocyte (left) cells and one neutrophil (right) cell of the human immune system. Lymphocytes (T-cells or B-cells) recognise foreign antigens and destroy invaders such as viruses and bacteria. Neutrophils engulf bacteria as well as releasing various substances, such as an antibacterial enzyme (lysozyme) and oxidizing agents. Both cell types have thin projections on their surface called filopodia, which are used for support and motility. Magnification x4750 at 6x7cm size.
Science Photo Library was founded in 1981 by Michael Marten, one of the authors of "Worlds Within Worlds", a book exploring different ways to observe the universe - from electron micrographs, to images of earthrise taken from the Apollo spacecraft. When Marten started receiving requests for the beautiful images in the book, he had an idea of setting up Science Photo Library.
Since then, Science Photo Library has continued to work alongside world acclaimed photographers and the leading science and medical experts to provide a central source of the best science and specialist imagery available. Although the collection started with scientific images, it has grown to encompass all aspects of science and their impact on everyday life.
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